DOI: 10.1007/s00338-019-01853-1
论文题名: Impacts of the 2014–2017 global bleaching event on a protected remote atoll in the Western Indian Ocean
作者: Cerutti J.M.B. ; Burt A.J. ; Haupt P. ; Bunbury N. ; Mumby P.J. ; Schaepman-Strub G.
刊名: Coral Reefs
ISSN: 7224028
出版年: 2020
卷: 39, 期: 1 语种: 英语
英文关键词: Aldabra Atoll
; Coral bleaching
; El Niño
; Marine protected area
; Seychelles
; UNESCO World Heritage Site
Scopus关键词: algal mat
; anthropogenic effect
; benthos
; coral bleaching
; El Nino
; marine park
; risk assessment
; satellite data
; sea surface temperature
; UNESCO
; World Heritage Site
; Aldabra
; Indian Ocean
; Indian Ocean (West)
; Seychelles
; Acroporidae
; Alcyonacea
; algae
; Anthozoa
; Isopora palifera
; Merulinidae
; Poritidae
; Rhytisma
英文摘要: The third global bleaching event caused prolonged elevated sea surface temperatures from 2014 to 2017 that heavily impacted coral reefs worldwide. This study determines changes in benthic community following this bleaching event at a remote UNESCO World Heritage Site in the Western Indian Ocean. Aldabra Atoll offers a rare opportunity to study global impacts in the absence of local anthropogenic stressors. Analysis of satellite-derived temperature data indicated that Aldabra was exposed to the highest bleaching-risk intensity of the past 20 years during this bleaching event. Bleaching-risk conditions lasted from December 2015 to June 2016 close to the 4 °C-week threshold, when bleaching is expected. Benthic cover was established pre- and post-bleaching from 21 transects across two reef locations (lagoonal reef, 2 m depth; seaward reef, 5 and 15 m depth). From a pre-bleaching benthic community in which living corals and epilithic algal matrix (EAM) predominated, Aldabra’s reefs switched to an EAM-dominated community 8 months after bleaching. Soft corals declined by 93% of their overall pre-bleaching cover to < 1%. Although overall hard-coral cover was also reduced, the decline varied among depths and might indicate local adaptations of the lagoonal reef, due to greater variability in sea surface temperature compared to the seaward reef. With the exception of Isopora palifera, all taxomorphic coral groups experienced a decline following bleaching. Overall, Rhytisma experienced a near-complete extirpation, Acroporids (excluding I. palifera) and branching Poritids declined by more than 80%, Merulinidae lost ca. 60% of their pre-bleaching cover, while massive Poritids cover slightly decreased. Aldabra’s benthic community therefore underwent substantial changes following the 2014–2017 bleaching event and showed that live coral cover declines significantly even in protected areas isolated from local anthropogenic pressures. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159585
Appears in Collections: 气候变化与战略
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作者单位: Department of Evolutionary Biology and Environmental Studies, University of Zürich, Winterthurerstrasse 190, Zürich, 8057, Switzerland; Department of Plant Science, University of Oxford, South Parks Road, Oxford, OX1 3RB, United Kingdom; Seychelles Islands Foundation, PO Box 853, Victoria, Mahé, Seychelles; Rhodes University, PO Box 94, Grahamstown, Eastern Cape 6140, South Africa; Centre for Ecology and Conservation, University of Exeter, Cornwall Campus, Penryn, TR10 9FE, United Kingdom; Marine Spatial Ecology Lab and ARC Centre of Excellence for Coral Reef Studies, School of Biological Sciences, University of Queensland, St Lucia, QLD 4072, Australia
Recommended Citation:
Cerutti J.M.B.,Burt A.J.,Haupt P.,et al. Impacts of the 2014–2017 global bleaching event on a protected remote atoll in the Western Indian Ocean[J]. Coral Reefs,2020-01-01,39(1)